5 ms·

dc is worth having installed because of this CLI gem alone: echo "[q]sa[ln0=aln256%Pln256/snlbx]sb729901041524823122snlbxq" | dc I've never tried to under

by c0l0 6y ago

dc is worth having installed because of this CLI gem alone: echo "[q]sa[ln0=aln256%Pln256/snlbx]sb729901041524823122snlbxq" | dc I've never tried to understand what's really going on to produce the result, but also wouldn't really know where to start - maybe someone in HN's audience can enlighten me? :)

em500 6y ago
dc and bc are standard POSIX utils (and also part of busybox for embedded systems) so for most unix-like systems they're installed by default unless you take active measures to exclude them.
- deleted 6y ago
  [deleted]
- c0l0 6y ago
  POSIX.1-2017 describes the `dc` program as "excluded" from the standard; check https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap04.html https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu... for details. Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik.
  - em500 6y ago
    I stand corrected, only bc is included in POSIX.
  - akira2501 6y ago
    Gentoo doesn't include it in the common 'stage3' tarball, either. Which is annoying because it's actually required to compile the linux kernel.
  - yjftsjthsd-h 6y ago
    > Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik. Yeah, I recently wrote a script that used bc and immediately discovered that it didn't work on at least Arch Linux (and I think others, although I only seem to have added it to the Arch ansible config...); conveniently, I only needed the most trivial of calculations, so I just shifted to awk, which has better default availability.
kps 6y ago
echo '1033333377708482P' | dc produces the same output using Unix dc but not in the GNU near-clone. (To understand why, you have to R the P as well as the M.)
na85 6y ago
https://stackoverflow.com/questions/37880810/how-come-is-this-command-returning-get-a-life https://stackoverflow.com/questions/37880810/how-come-is-thi...
m463 6y ago
echo 'EGSZ%%%'|tr 'E-Z%' 'R-ZA-M!'

by c0l0 6y ago

em500 6y ago

dc and bc are standard POSIX utils (and also part of busybox for embedded systems) so for most unix-like systems they're installed by default unless you take active measures to exclude them.

deleted 6y ago
[deleted]
c0l0 6y ago
POSIX.1-2017 describes the `dc` program as "excluded" from the standard; check https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap04.html https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu... for details. Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik.
- em500 6y ago
  I stand corrected, only bc is included in POSIX.
- akira2501 6y ago
  Gentoo doesn't include it in the common 'stage3' tarball, either. Which is annoying because it's actually required to compile the linux kernel.
- yjftsjthsd-h 6y ago
  > Many GNU/Linux distros (at least Debian and RHEL) install neither `dc` nor `bc` by default, afaik. Yeah, I recently wrote a script that used bc and immediately discovered that it didn't work on at least Arch Linux (and I think others, although I only seem to have added it to the Arch ansible config...); conveniently, I only needed the most trivial of calculations, so I just shifted to awk, which has better default availability.

kps 6y ago

echo '1033333377708482P' | dc produces the same output using Unix dc but not in the GNU near-clone. (To understand why, you have to R the P as well as the M.)

na85 6y ago

https://stackoverflow.com/questions/37880810/how-come-is-this-command-returning-get-a-life https://stackoverflow.com/questions/37880810/how-come-is-thi...

m463 6y ago

echo 'EGSZ%%%'|tr 'E-Z%' 'R-ZA-M!'